package com.example.mq.mqclient;

import com.example.mq.common.*;
import com.example.mq.mqserver.core.BasicProperties;
import com.example.mq.mqserver.core.ExchangeType;
import lombok.Data;
import org.apache.ibatis.annotations.Param;

import java.io.IOException;
import java.util.HashMap;
import java.util.Map;
import java.util.Random;
import java.util.UUID;
import java.util.concurrent.ConcurrentHashMap;

@Data
public class Channel {
    private String channelId;
    // 当前这个 channel 属于哪个 connection
    private Connection connection;

    // 用来存储后续客户端收到的服务器的响应
    private ConcurrentHashMap<String, BasicReturns> basicReturnsMap = new ConcurrentHashMap<>();
    // 如果当前 channel 订阅了某个队列，就需要在此处记录下对应的回调是啥。当该队列的消息返回回来的时候，调用回答
    // 此处约定一个 channel 中只能有一个 回答
    private Consumer consumer = null;

    public Channel(String channelId, Connection connection) {
        this.channelId = channelId;
        this.connection = connection;
    }

    //  在这个方法中，和服务器进行交互，告知服务器，此处客户端创建了新的channel
    public boolean createChannel() throws IOException {
        // 对于创建 Channel 操作来说，payload 就是一个 basicArguments 对象
        BasicArguments basicArguments = new BasicPublishArguments();
        basicArguments.setChannelId(channelId);
        basicArguments.setRid(generateRid());
        byte[] payload = BinaryTool.toBytes(basicArguments);
        Request request = new Request();
        request.setType(0x1);
        request.setLength(payload.length);
        request.setPayload(payload);
        // 构造请求完成后就可以发送请求了
        connection.writeRequest(request);
        // 等待服务器的响应
        BasicReturns basicReturns = waitResult(basicArguments.getRid());
        return basicReturns.isOk();
    }

    // 期望使用这个方法来阻塞等待服务器的响应
    private BasicReturns waitResult(String rid) {
        BasicReturns basicReturns = null;
        while ((basicReturns = basicReturnsMap.get(rid)) == null){
            // 如果查询结果为 null，说明包裹还没回来
            // 此时就需要阻塞等待
            synchronized (this){
                try {
                    wait();
                }catch (InterruptedException e){
                    e.printStackTrace();
                }
            }
        }
        // 读取成功后，从哈希表中删除
        basicReturnsMap.remove(rid);
        return basicReturns;
    }

    public void putReturns(BasicReturns basicReturns) {
        basicReturnsMap.put(basicReturns.getRid(),basicReturns);
        synchronized (this){
            // 当前不知道有多少个线程在等待响应
            // 把所有等待的线程都唤醒
            notifyAll();
        }
    }

    private String generateRid(){
        return "R-" + UUID.randomUUID();
    }


    // 关闭 channel, 给服务器发送 type == 0x2
    public boolean close() throws IOException {
        BasicArguments basicArguments = new BasicPublishArguments();
        basicArguments.setChannelId(channelId);
        basicArguments.setRid(generateRid());
        byte[] payload = BinaryTool.toBytes(basicArguments);
        Request request = new Request();
        request.setType(0x2);
        request.setLength(payload.length);
        request.setPayload(payload);
        connection.writeRequest(request);
        BasicReturns basicReturns = waitResult(basicArguments.getRid());
        return basicReturns.isOk();
    }

    // 创建交换机
    public boolean exchangeDelcare(String exchangeName, ExchangeType exchangeType,boolean durable,boolean autoDelete,
                                   Map<String,Object> arguments) throws IOException {
        ExchangeDelcareArguments exchangeDelcareArguments = new ExchangeDelcareArguments();
        exchangeDelcareArguments.setRid(generateRid());
        exchangeDelcareArguments.setChannelId(channelId);
        exchangeDelcareArguments.setExchangeName(exchangeName);
        exchangeDelcareArguments.setExchangeType(exchangeType);
        exchangeDelcareArguments.setDurable(durable);
        exchangeDelcareArguments.setAutoDelete(autoDelete);
        exchangeDelcareArguments.setArguments(arguments);

        byte[] payload = BinaryTool.toBytes(exchangeDelcareArguments);
        Request request = new Request();
        request.setType(0x3);
        request.setLength(payload.length);
        request.setPayload(payload);

        connection.writeRequest(request);

        BasicReturns basicReturns = waitResult(exchangeDelcareArguments.getRid());
        return basicReturns.isOk();
    }

    // 删除交换机
    public boolean exchangeDelete(String exchangeName) throws IOException {
        ExchangeDeleteArguments exchangeDeleteArguments = new ExchangeDeleteArguments();
        exchangeDeleteArguments.setRid(generateRid());
        exchangeDeleteArguments.setChannelId(channelId);
        exchangeDeleteArguments.setExchangeNamme(exchangeName);
        byte[] payload = BinaryTool.toBytes(exchangeDeleteArguments);

        Request request = new Request();
        request.setType(0x4);
        request.setLength(payload.length);
        request.setPayload(payload);
        connection.writeRequest(request);
        BasicReturns basicReturns = waitResult(exchangeDeleteArguments.getRid());
        return basicReturns.isOk();
    }

    // 创建队列
    public boolean queueDelcare(String queueName,boolean durable, boolean exclusive,boolean autoDelete,
                                Map<String,Object> arguments) throws IOException {
        QueueDelcareArguments queueDelcareArguments = new QueueDelcareArguments();
        queueDelcareArguments.setRid(generateRid());
        queueDelcareArguments.setChannelId(channelId);
        queueDelcareArguments.setQueueName(queueName);
        queueDelcareArguments.setDurable(durable);
        queueDelcareArguments.setExclusive(exclusive);
        queueDelcareArguments.setAutoDelete(autoDelete);
        queueDelcareArguments.setArguments(arguments);
        byte[] payload = BinaryTool.toBytes(queueDelcareArguments);

        Request request = new Request();
        request.setType(0x5);
        request.setLength(payload.length);
        request.setPayload(payload);
        connection.writeRequest(request);
        BasicReturns basicReturns = waitResult(queueDelcareArguments.getRid());
        return basicReturns.isOk();
    }

    // 删除队列
    public boolean queueDelete(String queueName) throws IOException {
        QueueDeleteArguments queueDeleteArguments = new QueueDeleteArguments();
        queueDeleteArguments.setRid(generateRid());
        queueDeleteArguments.setChannelId(channelId);
        queueDeleteArguments.setQueueName(queueName);
        byte[] payload = BinaryTool.toBytes(queueDeleteArguments);

        Request request = new Request();
        request.setType(0x6);
        request.setLength(payload.length);
        request.setPayload(payload);

        connection.writeRequest(request);
        BasicReturns basicReturns = waitResult(queueDeleteArguments.getRid());
        return basicReturns.isOk();
    }

    // 创建绑定
    public boolean queueBind(String queueName,String exchangeName,String bindingKey) throws IOException {
        QueueBindArguments queueBindArguments = new QueueBindArguments();
        queueBindArguments.setRid(generateRid());
        queueBindArguments.setChannelId(channelId);
        queueBindArguments.setQueueName(queueName);
        queueBindArguments.setExchangeName(exchangeName);
        queueBindArguments.setBindingKey(bindingKey);
        byte[] payload = BinaryTool.toBytes(queueBindArguments);

        Request request = new Request();
        request.setType(0x7);
        request.setLength(payload.length);
        request.setPayload(payload);

        connection.writeRequest(request);
        BasicReturns basicReturns = waitResult(queueBindArguments.getRid());
        return basicReturns.isOk();
    }

    // 解除绑定
    public boolean queueUnBinde(String queueName,String exchangeName) throws IOException {
        QueueUnBindArguments queueUnBindArguments = new QueueUnBindArguments();
        queueUnBindArguments.setRid(generateRid());
        queueUnBindArguments.setChannelId(channelId);
        queueUnBindArguments.setQueueName(queueName);
        queueUnBindArguments.setExchangeName(exchangeName);
        byte[] payload = BinaryTool.toBytes(queueUnBindArguments);

        Request request = new Request();
        request.setType(0x8);
        request.setLength(payload.length);
        request.setPayload(payload);

        connection.writeRequest(request);
        BasicReturns basicReturns = waitResult(queueUnBindArguments.getRid());
        return basicReturns.isOk();
    }

    // 发送消息
    public boolean basicPublish(String echangeName, String routingKey, BasicProperties basicProperties,byte[] body) throws IOException {
        BasicPublishArguments basicPublishArguments = new BasicPublishArguments();
        basicPublishArguments.setRid(generateRid());
        basicPublishArguments.setChannelId(channelId);
        basicPublishArguments.setExchangeName(echangeName);
        basicPublishArguments.setRoutingKey(routingKey);
        basicPublishArguments.setBasicProperties(basicProperties);
        basicPublishArguments.setBody(body);
        byte[] payload = BinaryTool.toBytes(basicPublishArguments);

        Request request = new Request();
        request.setType(0x9);
        request.setLength(payload.length);
        request.setPayload(payload);

        connection.writeRequest(request);
        BasicReturns basicReturns = waitResult(basicPublishArguments.getRid());
        return basicReturns.isOk();

    }

    // 订阅消息
    public boolean basicConsume(String queueName,boolean autoAck, Consumer consumer) throws MqException, IOException {
        // 先设置回调
        if (this.consumer != null){
            throw new MqException("该 channel 已经设置过消费消息的回调了，不能重复设置");
        }
        this.consumer = consumer;
        BasicConsumeArguments basicConsumeArguments = new BasicConsumeArguments();
        basicConsumeArguments.setRid(generateRid());
        basicConsumeArguments.setChannelId(channelId);
        basicConsumeArguments.setConsumerTag(channelId); // 此处的 consumerTag 也使用 channelId 来表示
        basicConsumeArguments.setQueueName(queueName);
        basicConsumeArguments.setAutoAck(autoAck);
        byte[] payload = BinaryTool.toBytes(basicConsumeArguments);

        Request request = new Request();
        request.setType(0xa);
        request.setLength(payload.length);
        request.setPayload(payload);

        connection.writeRequest(request);
        BasicReturns basicReturns = waitResult(basicConsumeArguments.getRid());
        return basicReturns.isOk();
    }

    // 确认消息
    public boolean basicAck(String queueName,String messageId) throws IOException {
        BasicAckArguments basicAckArguments = new BasicAckArguments();
        basicAckArguments.setRid(generateRid());
        basicAckArguments.setChannelId(channelId);
        basicAckArguments.setQueueName(queueName);
        basicAckArguments.setMessageId(messageId);
        byte[] payload = BinaryTool.toBytes(basicAckArguments);

        Request request = new Request();
        request.setType(0xb);
        request.setLength(payload.length);
        request.setPayload(payload);

        connection.writeRequest(request);
        BasicReturns basicReturns = waitResult(basicAckArguments.getRid());
        return basicReturns.isOk();
    }



}
